Secrets of the Rocks; Or, The Story of the Hills and the Gulches: A Manual of Hints and Helps for the Prospector and Miner ...Hall & Williams, 1904 - 491 pagina's |
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acid antimony arsenic assay Atomic weight auriferous beds brittle California called carbon cent cerussite chemical chloride clay cleavage cobalt color composition compound Comstock Comstock lode condensed contains copper creek crystalline crystals deposits depth dikes diorite earth earth's crust elements exist feet feldspar fissures flume formation fracture galena gaseous gases geological globe gneiss gold gold-bearing granite gravel gulch hardness heat hills hornblende hydrogen igneous rocks iron iron pyrites lava lead limestone lode luster mass mercury miles mineral mineral veins mining molten mountains native nature nickel nitric acid nugget occurs operation original outcrop oxide oxygen particles placer mining porphyry pounds precious metal prospecting prospector pyrites quartz rich river roasting sand Sandstone silica silver slate sluice solid sometimes specific gravity specimen strata stratified rocks streams substances sulphide sulphur sulphuret surface tains tellurium texture tion vapor volcanic washed yellow yielded zinc
Populaire passages
Pagina 72 - Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain the same number of molecules...
Pagina 377 - placer claim," as here used, is meant ground within defined boundaries which contains mineral in its earth, sand or gravel ; ground that includes valuable deposits not in place, that is, not fixed in rock, but which are in a loose state, and may in most cases be collected by washing or amalgamation without milling.
Pagina 213 - Beyond, leaning against the sky, are the snowy peaks, all of which are from thirteen to (nearly) fifteen thousand feet above the sea. These three chains, with their varying but never discordant undulations, are as inspiring to the imagination as they are enchanting to the eye. They hint of concealed grandeurs in all the glens and parks among them, and yet hold you back with a doubt, whether they can be more beautiful near at hand than when beheld at this distance.
Pagina 267 - The common form of a glacier is a river of ice filling a valley, and pouring down its mass into other valleys yet lower. It is not a frozen ocean, but a frozen torrent. Its origin or fountain is in the ramifications of the higher valleys and gorges, which descend amongst the mountains perpetually snow-clad; but what gives to a glacier its most peculiar and characteristic feature is, that it does not belong exclusively or necessarily to the snowy regions already mentioned.
Pagina 219 - The vapors do not appear at the surface till they have heated the water to their own temperature. When so much vapor has escaped that the expansive force of that which remains has become less than the pressure of the confining column of water, tranquillity is restored, and this lasts until such a quantity of vapor is again collected as to produce a fresh eruption. The spouting of the spring is therefore repeated at intervals, depending upon the capacity of the cavern, the height of the column of...
Pagina 60 - ... and porphyries into gravel, occasioned by the decomposition of the mica and feldspar. In its more limited sense, the term metamorphic is confined to those changes of the rock which are produced, directly or indirectly, by agencies seated in the interior of the earth. In many cases the mode...
Pagina 89 - ... for dishonour," or the builder can apply the same bricks as part either of a palace or a pig-stye. This, when we think seriously of it, is really the most wonderful part of the whole wide field of nature; and it is the one in which the foundations of all our knowledge of nature's working are laid. The solvent power of heat, which loosens the firm cohesion of the diamond with as much ease and certainty as it melts ice into water, or the sunbeams into all those tints of colour that enliven the...
Pagina 213 - Oberland, you might obtain a tolerable idea of this view of the Rocky Mountains. Pike's Peak would then represent the Jungfrau : a nameless snowy giant in front of you, Monte Rosa ; and Long's Peak, Mont Blanc.
Pagina 143 - The gold in these regions is found in its native state, in small grains, in spangles, in crystals so small as to be almost invisible to the naked eye, and also in lumps of ten and twenty pounds weight. These grains of gold are...
Pagina 377 - The yellow metal is not found in paying quantities in the main river, but in the small streams which cut through the mountains on either side.